AZ Repeaters Repeater Offsets

Offset is the difference between receive and transmit frequencies of a radio channel.
Most commonly it refers to the separation between the input frequency and output frequency of a repeater or other type of full duplex system.
This should not be confused with the trunking offset required when programming certain types of trunked radio systems in scanners.
For example, a mobile radio receives on 146.94 and transmits on 146.34 in order to operate on a repeater. 146.94 - 146.34 = 0.6 (0.6 MHz or 600 kHz)
Since in this case the transmit frequency is lower than the receive frequency, it is said to have a negative offset of 600 kHz or −600 kHz.

Certain bands and frequency ranges in the United States have standardized offsets. tandart US Offsets ALSO NOTE-repeater subband / Ham radio offsets can vary in certain areas of the country. Some repeaters in some areas may use non standard offsets and are commonly referred to as odd split repeaters

Band

Frequency Range (MHz)

Offset

Notes

Frequency Shift

10m

29.5–29.7

−100 kHz

Repeater subband

Starting at:

6m

50–54

−500 kHz or −1 MHz

-

Starting at:

2m

144–148

+600 kHz or −600 kHz

-

Begin at 145.100-shift to 145.495 then 146.000+ shift to 146.495 Then again at 146.600- shift to 147.000+ shift to 147.395 then 147.600- shift to 147.995

1.25m

222–225

−1.6 MHz

-

Starting at: 223.920- shift to 224.980

70cm

440–450

+5 MHz or −5 MHz

-

Starting at: 440.000 to 444.975+ shift and then 445.000 to 449.975- shift